Hi Kevin.
You need to edit the css file found in the themes folder.
Put your URL in here and it will hilight the errors.
If you don't know css, I'd advise finding a tutorial. This site has some helpers.
If I were you, I'd find a trusted theme from wordpress, and then edit it little by little, testing each change. Your 'look' will be more generic, but it won't blow up on you. BTW I got it to work in IE7 just by going 'back' after the error.
I'd check out this error too
URI : http://kbb2.com/
43 Lexical error at line 43, column 81. Encountered: "?" (63), after : ""